Malicious PDF — malware analysis report

Static analysis result for SHA-256 989cbc58a1207967…

MALICIOUS

PDF

84.3 KB Created: 2021-07-01 14:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 579893bf90f0c3d98c12ff7efa140861 SHA-1: 47d73ed280a302402b6606f09b36b6d953a6a9ca SHA-256: 989cbc58a120796731b9b544dec45fb60855e1dab5eb2de0250d5754d6b43195
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating its nature. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The presence of embedded JavaScript and the link farm structure strongly indicate a malicious intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608533fda29df---nufejefago.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bf007777c---58512634579.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/kepefopepigodeku.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7eed859eebbb2133e68368ed1466a93c/nabomonalitoredomuxinimuf.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/8bd2d65eecac968236aca77c5cdaace6/13532925938.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/eea01fa6e1104056b57ef823c16612f1/rimavejoxelikelaka.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071daf2f0562---wotenago.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1987eb34a---40492324339.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5f05d5830e80c459e6aa5ef91edb92a9/mupebisidixalopazuj.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sakonukodabigapurinotex.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/16945050105.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90059879025.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9d5bf12a779bac63e4f235cca897b578/kezumulipitisoni.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a557e782809fcdcf5549940dbfe8d44b/kupefijojogo.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/mijalurokuse.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/uif4hvd98oasegdllfhgm9r8o7/6727536154.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/rovumevilivowotepafubu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/007aca7c87f46087f28b31655ae2d4dc/67912259567.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0oruf9u861a9qn0jutsgdvd3c7/rekaromufexopusameruzano.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/57050962086.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b030eb772e6---fitotunatunosid.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b9b45f85d4e9af17fbe1890d7681ba31/togitefo.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210503210509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=assassin%27s+creed+unity+achievementsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C0 18796 bytes
SHA-256: 50810526c8f73e7b32363c37b5249dc2090b577f2a0a09ede7e32b942d7ea487
font_01_sfnt_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 10764 bytes
SHA-256: ca913c93b282296bbc5103322a058498ff9abbc3b6dc75c1afb2313453a6c07a
font_02_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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